In this paper, the rotatory bending fretting fatigue damage analysis of railway axle and simulation tests of small-scale wheel set have been carried out. The simulation test results of rotatory bending fretting fatigue behaviour on small-scale sample were in good agreement with the results of damage analysis on real axle. Several conclusions can be drawn as follows: (1) In situ incision method worked well to obtain the fretting damage surfaces of railway axle without any additional damage. (2) Both for the real and small-scale axles, the fretting fatigue damage scars could be divided into three zones, and the fatigue cracks were found in the inner fretting scars. The fretting wear damage mechanisms of fretting damage scars for them were the same: that is, were die combination of abrasive wear, oxidative wear and delamination. (3) The characters of rotatory fretting fatigue fracture surface morphology present multisources and step pattern. The fretting fatigue crack initiated at the subsurface and started from some inclusion cavities. The fretting fatigue crack first propagated along an inclined angle which is controlled by the contact stresses of interference fit. And then the cracks turned to the direction close to the radial direction of axle where the propagation was controlled by the combination of the contact stresses and bulk fatigue stresses. (4) Under the medium bending fatigue load (about bending stress of 144 MPa), the fatigue life was at its lowest, which is probably due to the effect of mixed fretting regime. When the simulation speed increased from 1800 to 2100 rpm, the fretting fatigue life reduced obviously. (5) Experimental study on small-scale axle is an effective way to understand fretting damage mechanisms of real railway axle. However, a scale effect factor should be employed to relate experimental results of fatigue life on small-scale axle with the real one.
An investigation on rotatory bending fretting fatigue damage of railway axles
Eine Untersuchung des Schadens durch Rotationsbiegekontaktermüdung von Eisenbahnachsen
Fatigue and Fracture of Engineering Materials and Structures ; 37 , 1 ; 72-84
2014
13 Seiten, 16 Bilder, 2 Tabellen, 25 Quellen
Aufsatz (Zeitschrift)
Englisch
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